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birdman 6 year s ago
#3... Concrete no longer lasts? No way! Modern concrete lasts way longer than 50 years in fact it is constantly getting harder ... never stops. Unless not mixed right in the first place Check out what the Germans built 70 years ago on coast lines .... not even phased after 75+ years
The Julian Calendar
Many different calendars existed in Roman history, leading all the way up to the Julian calendar, which was the best calendar they had in ancient Rome. Most of our Gregorian calendar is based on the Julian one, including months, days, and the leap year. The Gregorian calendar was instituted to fix several of the Julian calendar’s problems.
-1
1.
birdman 6 year s ago
#3... Concrete no longer lasts? No way! Modern concrete lasts way longer than 50 years in fact it is constantly getting harder ... never stops. Unless not mixed right in the first place Check out what the Germans built 70 years ago on coast lines .... not even phased after 75+ years